Malicious PDF — malware analysis report

Static analysis result for SHA-256 5222a6f5a92a12db…

MALICIOUS

PDF

113.4 KB Created: 2021-06-25 22:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4031fa22bb2b201aa7866e280e5a69f5 SHA-1: bfb41876e43380144fd4225e828a6436b5450876 SHA-256: 5222a6f5a92a12db78c6b60bc1d913a69724cbeb461e7d6b1289fa10a2ad6152
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely executes malicious code, and the link farm serves to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 6

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://medvor.ru/uplcv?utm_term=gw2+ascended+armor+guide PDF link annotation
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/38dd181de529fe6298b1dcc74ca994be/65590251950.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/36005224451.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079d03fe2efc---87329686170.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160750015577e3---guxufamajijudokowojax.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/4aeb509e49a74e4170373e0724c2c854/bujipujukawatulinek.pdfIn PDF document text
    • http://alkanboya.com/files/file///61656024389.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094c2af77737---vitiwumaburu.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062322190252.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/waguzexexemezig.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/agf3dm0mr9mtocll5mlgbkdin7/gulefibokisavesidakodaziw.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16097025592e26---gafivigegudoweki.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160946cf5e594e---89975318440.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca5f45941d---14230738680.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/3597333686.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/p68knmdbqe1foephtq5tda9t64/pifisukovoroxoxikafuxina.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/453fedcf9ae0a6c41e6c7dfceeb437ba/13665649029.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606c879783505---piwitekogilumafakitora.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/lajasidanawilap.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a806ba5a1---35470203301.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/litibopederodadodavujago.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/f7ff63e46f324c22c8bba4040f1f42e8/sunaxoduvizi.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/potoruloketunirel.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f708570e6faa40f3ef7d140a7f1856bc/45097317122.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/bb81cf74857a09810749db526a96bd5d/zakiditinaruxup.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14267 17612 bytes
SHA-256: a634dd96a58b9585e224f62bc48aec2572c9826b97dc446f595a38f1cad5e374
font_01_sfnt_off0001709b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1709B 16288 bytes
SHA-256: 7c93e5221d766c39152cd7abac4c148a15b28f78015f3f131597034060f1c414
font_02_sfnt_off0001869d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1869D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00019eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EB4 10912 bytes
SHA-256: 6c90c00524cdcd7ee47d282ed1582aa82e01f9ee159b502b392add12b5db504f

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